使用github workflow构建docker镜像并发布到dockerhub

创建项目:

git clone https://github.com/venbill/demoimage.git

.github/workflows/docker-image.yml 为githubworkflow配置文件
Dockerfile为镜像构建文件
index.html为拷贝到镜像中的文件

docker-image.yml解释

name: Docker Image CI

on:
  push:
    tags:
      - 'v*'

jobs:

  build:

    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v2

      - name: Set version
        id: version
        run: echo ::set-output name=release_version::${GITHUB_REF#refs/*/}

      -
        name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Login to DockerHub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          platforms: |
            linux/amd64
          push: true
          build-args: |
            APP_NAME=${{ github.event.repository.name }}
          tags: |
            ${{ secrets.DOCKERHUB_USERNAME }}/${{ github.event.repository.name }}:latest
            ${{ secrets.DOCKERHUB_USERNAME }}/${{ github.event.repository.name }}:${{ steps.version.outputs.release_version }}

on.push.branches: [ master ]
#master分支push触发构建

on.push.tags:- 'v*'
#以v开头的tag触发构建

runs-on: ubuntu-latest
构建镜像所在系统

actions/checkout@v2
拉代码

QEMU
qemu是一个和vmware类似的虚拟化工具

Docker Buildx
构建工具

Build and push
构建镜像，并且push到中央仓库

platforms: linux/amd64
构建镜像对应的平台，受到from镜像限制